Concord furnaces are made by AlliedAir, a subsidiary of Lennox (www dot alliedair dot com -- we are not supposed to put Email addy's on the forum for technical reason). Your furnace came from the Lennox plant in Marshallatown Iowa. Myself and Bob above are AlliedAir dealers in South.
I second what Bob said, contact tech support at AlliedAir , ask for Kyle. Tell Kyle Bob or John sent you.
As noted, have the flash count and manuals handy.
Best to you, hope you get your heat working again.
GA-HVAC-Tech
Your comfort, Your way, Everyday!
GA's basic rules of home heating and AC upgrades:
*Installation is more important than the brand of equipment
*The duct system keeps the house comfortable; the equipment only heats and cools (and dehumidifies)
*The value of comfort, over the long term; leave economic choices behind!
Choose your contractor wisely!